Vitamin D
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A nutrient that is obtained from the diet and can be made in the skin after exposure to sunlight. Vitamin d acts as a hormone. It helps to form and maintain strong bones, maintain normal blood levels of calcium and phosphorus, and increase calcium absorption; it also helps to maintain a healthy immune system and control cell growth. Vitamin d is found in some foods, including some types of fatty fish, and milk and breakfast cereals that are fortified with vitamin d.
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